US20050282860A1 - Fexofenadine polymorphs and process for the preparation thereof - Google Patents
Fexofenadine polymorphs and process for the preparation thereof Download PDFInfo
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- US20050282860A1 US20050282860A1 US11/145,927 US14592705A US2005282860A1 US 20050282860 A1 US20050282860 A1 US 20050282860A1 US 14592705 A US14592705 A US 14592705A US 2005282860 A1 US2005282860 A1 US 2005282860A1
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
- C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
- C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
- C07D211/18—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D211/20—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by singly bound oxygen or sulphur atoms
- C07D211/22—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by singly bound oxygen or sulphur atoms by oxygen atoms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P11/00—Drugs for disorders of the respiratory system
- A61P11/08—Bronchodilators
Definitions
- the present invention relates to novel crystalline forms of fexofenadine hydrochloride, in particular a hydrated form and a solvate with acetonitrile, their use in therapy and a process for their preparation.
- the invention further relates to a process for the preparation of the known polymorphic form A of anhydrous fexofenadine hydrochloride.
- Fexofenadine hydrochloride (4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]- ⁇ , ⁇ -dimethylbenzeneacetic acid hydrochloride)
- WO 02/066429 discloses anhydrous fexofenadine hydrochloride polymorphic form A and a process for the preparation thereof.
- U.S. 2003/0021849 discloses other crystalline forms of fexofenadine hydrochloride, such as solvates with methyl butyl ether (MTBE) and cyclohexane, referred to as MBTE form IX and cyclohexane form IX, as well as solvates with ethyl acetate, referred to as forms XIV and XV.
- MTBE methyl butyl ether
- IX cyclohexane
- forms XIV and XV solvates with ethyl acetate
- WO 95/31437 discloses the preparation of polymorphs, or pseudopolymorphs and hydrates of fexofenadine hydrochloride (form II and IV) and their conversion to anhydrous polymorphic forms (form I and II) by azeotropical distillation or recrystallization to “minimize the water content”.
- the invention provides a novel approximately monohydrate crystalline form of fexofenadine hydrochloride, hereinafter referred to as form B, and a method for its preparation.
- the invention provides a novel crystalline form of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, hereinafter referred to as form C, and a method for its preparation.
- the invention provides the use of fexofenadine hydrochloride form C for the preparation of the known form A.
- the invention provides a pharmaceutical composition containing fexofenadine hydrochloride form B and/or C as active ingredient in admixture with an excipient and/or carrier, and its use in therapy.
- the novel crystalline forms B and C and the known form A were characterized by XRPD (X-ray powder diffraction) technique.
- the DSC (Differential Scanning Calorimetry) spectra were recorded with a DSC 822e calorimeter (Mettler-Toledo), in a temperature range of 30-250° C., with a scanning rate of 10° C./minute.
- the 1 H-NMR spectra were recorded with a Varian Mercury 300 spectrometer, using DMSO-d 6 as the solvent.
- FIG. 1 XRPD spectrum (X-ray powder diffraction) of fexofenadine hydrochloride form B.
- FIG. 2 DSC spectrum of fexofenadine hydrochloride form B.
- FIG. 3 XRPD spectrum of fexofenadine hydrochloride form C.
- FIG. 4 1 H-NMR spectrum of fexofenadine hydrochloride form C.
- “approximately monohydrate” means that the crystalline solid has a water content of about 0.8-1.2 mols per mol of fexofenadine hydrochloride, preferably from about 0.9 to 1.1 mols. “Approximately monosolvate” means that the crystalline solid has an acetonitrile content of about 0.8-1.2 mols of solvent per mol fexofenadine hydrochloride, preferably from 0.9 to 1.1 mols.
- precipitation has the same meaning as crystallization (or “crystal”), and indicates the obtainment of a solid form.
- the present invention relates to a novel approximately monohydrate, crystalline form of fexofenadine hydrochloride, hereinafter defined as form B, having an XRPD spectrum substantially as illustrated in FIG. 1 , wherein the more intense diffraction peaks fall at 23.6; 10.1; 7.9; 5.2; 4.7 and 4.4 in 20, and a DSC spectrum having three endotermic peaks at about 80.27; 109.27 and 149.14° C.; said form B being prepared through a process comprising the following steps:
- Fexofenadine hydrochloride can be obtained by reduction of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]- ⁇ , ⁇ -dimethylbenzeneacetic acid, or an alkyl ester thereof, with a suitable reducing agent, optionally followed by hydrolysis, as known in the art.
- the methanol/water ratio in the mixture containing the solution of fexofenadine hydrochloride is for example between 0.8 and 1.25 v/v, preferably from 0.9 and 1.1 v/v, in particular around 1 v/v.
- the mixture is usually cooled slowly, preferably at a temperature ranging from ⁇ 10 to ⁇ 25° C., more preferably from ⁇ 12 to ⁇ 20° C.
- the precipitate is filtered off or decanted, preferably filtered off and, after washing with a water-methanol mixture in a volume ratio of 0.8 to 1.25 v/v, preferably from 0.9 to 1.1 v/v, in particular around 1 v/v, is dried to constant weight at 50-60° C., preferably under vacuum at approximately 40° C.
- Karl-Fischer analysis of the resulting product shows that novel crystalline form B of fexofenadine hydrochloride hydrate has a water content ranging from about 3 to 5%, so that it can be properly defined as “approximately monohydrate”.
- the invention provides a novel crystalline form of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, hereinafter referred to as form C, having an XRPD spectrum substantially as illustrated in FIG. 3 , wherein the most intense diffraction peaks fall at 7.0; 11.6; 15.4; 17.3; 18.0 and 20.5 in 20; and a 1 H-NMR spectrum substantially as illustrated in FIG. 4 .
- the novel form can be prepared by means of a process comprising the following steps:
- Fexofenadine hydrochloride hydrate used as starting material, can be prepared according to known methods, for example as disclosed in WO 95/31437, or can be the novel form B which is disclosed herein.
- the acetonitrile dispersion is heated for a time ranging from about 15 minutes to one hour, preferably from 30 to 45 minutes, then cooled preferably to a temperature ranging from about ⁇ 15 to ⁇ 10° C., for a time sufficient to obtain complete precipitation of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, typically from about 15 minutes to 8 hours, preferably for about 5 hours.
- the dispersion of fexofenadine hydrochloride hydrate in acetonitrile is obtained pouring fexofenadine hydrochloride hydrate in acetonitrile, previously heated to about 35-60° C., preferably to about 40-55° C., in particular 45° C., in a weight/volume ratio ranging from about 1/8 to 1/15, preferably of about 1/10.
- Fexofenadine hydrochloride hydrate is added to acetonitrile until all the fexofenadine is dissolved, keeping the temperature between about 70° C. and the reflux temperature.
- fexofenadine hydrochloride form C starts to crystallise and precipitate.
- the acetonitrile dispersion is cooled to a temperature lower than ⁇ 5° C., preferably to about ⁇ 15/ ⁇ 10° C., in about four hours.
- the precipitate is then separated with known techniques, for example filtration or decantation of the solvent, preferably filtration.
- the product is then dried at a temperature of about 60° C. or lower, preferably under vacuum at approximately 50° C. for 10 hours.
- a further object of the invention is a process for the preparation of anhydrous fexofenadine hydrochloride form A, disclosed in WO 02/066429, comprising removing acetonitrile from crystals of fexofenadine hydrochloride form C, as herein defined.
- the removal of acetonitrile from fexofenadine hydrochloride form C can be carried out with any suitable physical means, preferably by heating under vacuum at about 80-110° C. for a time ranging from about 18 to 70 hours, more preferably at about 100° C. under vacuum for about 24-30 hours.
- novel fexofenadine hydrochloride forms B and C are useful for the administration of fexofenadine in mammals in the need of said treatment. They can be administered alone or in combination or in admixture with one or more known polymorphic forms of fexofenadine hydrochloride, for example those disclosed in WO 02/066429, U.S. 2003/0021849 or WO 95/31437.
- the content of each form in the mixtures depends on their physical and biological properties and will be determined by the skilled person.
- a variety of pharmaceutical compositions can be prepared for the administration in humans or animals, according to known techniques.
- the invention also provides a pharmaceutical composition
- a pharmaceutical composition comprising, as active ingredient, fexofenadine hydrochloride form B and/or C, or mixtures of at least one of them with one or more known polymorphic forms of fexofenadine hydrochloride in admixture with a suitable carrier and/or excipient.
- Said pharmaceutical composition can also optionally contain a therapeutically effective amount of pseudoephedrine.
- 262 g of fexofenadine hydrochloride form C, obtained as described in Example 2, are ground and dried under vacuum at 100° C. for 24 hours.
- 244 g of fexofenadine hydrochloride anhydrous form A are obtained, having a melting point between 153 and 156° C. and a XRPD spectrum having substantially the same characteristics as those reported in table 1 of WO 02/066429.
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Abstract
The invention provides novel crystalline forms of fexofenadine hydrochloride, a process for the preparation of the novel forms and of the known form A, and their use in therapy.
Description
- The present invention relates to novel crystalline forms of fexofenadine hydrochloride, in particular a hydrated form and a solvate with acetonitrile, their use in therapy and a process for their preparation. The invention further relates to a process for the preparation of the known polymorphic form A of anhydrous fexofenadine hydrochloride.
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- is an antihistaminic, antiallergic and bronchodilator medicament, marketed in the USA under the tradename Allegra®.
- WO 02/066429 discloses anhydrous fexofenadine hydrochloride polymorphic form A and a process for the preparation thereof.
- U.S. 2003/0021849 discloses other crystalline forms of fexofenadine hydrochloride, such as solvates with methyl butyl ether (MTBE) and cyclohexane, referred to as MBTE form IX and cyclohexane form IX, as well as solvates with ethyl acetate, referred to as forms XIV and XV.
- WO 95/31437 discloses the preparation of polymorphs, or pseudopolymorphs and hydrates of fexofenadine hydrochloride (form II and IV) and their conversion to anhydrous polymorphic forms (form I and II) by azeotropical distillation or recrystallization to “minimize the water content”.
- Different forms of biologically active compounds, such as polymorphs, are known to have different bioavailability, release time and solubility, which allow, for example, dose reduction or prolonged administration intervals. Moreover, the different physical properties that are often associated to different physical forms of medicaments can be advantageously exploited in the manufacture of pharmaceutical formulations.
- There is therefore the need to provide novel polymorphic forms of biologically active compounds with advantageous properties.
- In a first aspect the invention provides a novel approximately monohydrate crystalline form of fexofenadine hydrochloride, hereinafter referred to as form B, and a method for its preparation.
- In a second aspect the invention provides a novel crystalline form of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, hereinafter referred to as form C, and a method for its preparation.
- In a further aspect, the invention provides the use of fexofenadine hydrochloride form C for the preparation of the known form A.
- Furthermore, the invention provides a pharmaceutical composition containing fexofenadine hydrochloride form B and/or C as active ingredient in admixture with an excipient and/or carrier, and its use in therapy.
- The novel crystalline forms B and C and the known form A were characterized by XRPD (X-ray powder diffraction) technique. The X-ray diffraction spectra (XRPD) were registered with an APD 2000 θ/θ automatic diffractometer for powders and liquids (Ital-Structures), under the following operative conditions: radiation CuKα (λ=1.5418 Å), scanning with a 0.03° C. angular step for 1 sec. The DSC (Differential Scanning Calorimetry) spectra were recorded with a DSC 822e calorimeter (Mettler-Toledo), in a temperature range of 30-250° C., with a scanning rate of 10° C./minute. The 1H-NMR spectra were recorded with a Varian Mercury 300 spectrometer, using DMSO-d6 as the solvent.
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FIG. 1 . XRPD spectrum (X-ray powder diffraction) of fexofenadine hydrochloride form B. -
FIG. 2 . DSC spectrum of fexofenadine hydrochloride form B. -
FIG. 3 . XRPD spectrum of fexofenadine hydrochloride form C. -
FIG. 4 . 1H-NMR spectrum of fexofenadine hydrochloride form C. - According to the present invention, “approximately monohydrate” means that the crystalline solid has a water content of about 0.8-1.2 mols per mol of fexofenadine hydrochloride, preferably from about 0.9 to 1.1 mols. “Approximately monosolvate” means that the crystalline solid has an acetonitrile content of about 0.8-1.2 mols of solvent per mol fexofenadine hydrochloride, preferably from 0.9 to 1.1 mols.
- As used in the following, the term precipitation (or “precipitate”) has the same meaning as crystallization (or “crystal”), and indicates the obtainment of a solid form.
- The present invention relates to a novel approximately monohydrate, crystalline form of fexofenadine hydrochloride, hereinafter defined as form B, having an XRPD spectrum substantially as illustrated in
FIG. 1 , wherein the more intense diffraction peaks fall at 23.6; 10.1; 7.9; 5.2; 4.7 and 4.4 in 20, and a DSC spectrum having three endotermic peaks at about 80.27; 109.27 and 149.14° C.; said form B being prepared through a process comprising the following steps: -
- preparation of a solution of fexofenadine hydrochloride in a methanol/water mixture;
- cooling of the mixture at a temperature lower than −5° C.; and
- separation of the precipitate.
- Fexofenadine hydrochloride can be obtained by reduction of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]-α,α-dimethylbenzeneacetic acid, or an alkyl ester thereof, with a suitable reducing agent, optionally followed by hydrolysis, as known in the art.
- The methanol/water ratio in the mixture containing the solution of fexofenadine hydrochloride is for example between 0.8 and 1.25 v/v, preferably from 0.9 and 1.1 v/v, in particular around 1 v/v.
- The mixture is usually cooled slowly, preferably at a temperature ranging from −10 to −25° C., more preferably from −12 to −20° C.
- The precipitate is filtered off or decanted, preferably filtered off and, after washing with a water-methanol mixture in a volume ratio of 0.8 to 1.25 v/v, preferably from 0.9 to 1.1 v/v, in particular around 1 v/v, is dried to constant weight at 50-60° C., preferably under vacuum at approximately 40° C. Karl-Fischer analysis of the resulting product shows that novel crystalline form B of fexofenadine hydrochloride hydrate has a water content ranging from about 3 to 5%, so that it can be properly defined as “approximately monohydrate”.
- In a second aspect, the invention provides a novel crystalline form of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, hereinafter referred to as form C, having an XRPD spectrum substantially as illustrated in
FIG. 3 , wherein the most intense diffraction peaks fall at 7.0; 11.6; 15.4; 17.3; 18.0 and 20.5 in 20; and a 1H-NMR spectrum substantially as illustrated inFIG. 4 . The novel form can be prepared by means of a process comprising the following steps: -
- preparation of a dispersion of fexofenadine hydrochloride hydrate in acetonitrile;
- heating of the dispersion at a temperature ranging from about 70° C. to the reflux temperature;
- cooling of the dispersion at a temperature lower than −5° C.; and
- separation of the precipitate.
- Fexofenadine hydrochloride hydrate, used as starting material, can be prepared according to known methods, for example as disclosed in WO 95/31437, or can be the novel form B which is disclosed herein.
- The acetonitrile dispersion is heated for a time ranging from about 15 minutes to one hour, preferably from 30 to 45 minutes, then cooled preferably to a temperature ranging from about −15 to −10° C., for a time sufficient to obtain complete precipitation of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, typically from about 15 minutes to 8 hours, preferably for about 5 hours.
- According to a preferred aspect of the invention, the dispersion of fexofenadine hydrochloride hydrate in acetonitrile is obtained pouring fexofenadine hydrochloride hydrate in acetonitrile, previously heated to about 35-60° C., preferably to about 40-55° C., in particular 45° C., in a weight/volume ratio ranging from about 1/8 to 1/15, preferably of about 1/10. Fexofenadine hydrochloride hydrate is added to acetonitrile until all the fexofenadine is dissolved, keeping the temperature between about 70° C. and the reflux temperature. During this phase fexofenadine hydrochloride form C starts to crystallise and precipitate. The acetonitrile dispersion is cooled to a temperature lower than −5° C., preferably to about −15/−10° C., in about four hours. The precipitate is then separated with known techniques, for example filtration or decantation of the solvent, preferably filtration. The product is then dried at a temperature of about 60° C. or lower, preferably under vacuum at approximately 50° C. for 10 hours. NMR analysis of the resulting product shows that novel crystalline form C of fexofenadine hydrochloride has an acetonitrile content ranging from about 6.5 to 7.5%, therefore it can be properly defined as “approximately monosolvate”.
- The skilled chemist will note that the conditions to obtain the dissolution of fexofenadine hydrochloride in methanol/water, or the dispersion of fexofenadine monohydrate in acetonitrile, can be modified without altering the form of the resulting polymorph. Likewise, the crystallization techniques may slightly differ from those herein described without altering the polymorphic form obtained. For example, crystallization can be promoted by addition of pre-formed crystals.
- A further object of the invention is a process for the preparation of anhydrous fexofenadine hydrochloride form A, disclosed in WO 02/066429, comprising removing acetonitrile from crystals of fexofenadine hydrochloride form C, as herein defined.
- The removal of acetonitrile from fexofenadine hydrochloride form C can be carried out with any suitable physical means, preferably by heating under vacuum at about 80-110° C. for a time ranging from about 18 to 70 hours, more preferably at about 100° C. under vacuum for about 24-30 hours.
- The novel fexofenadine hydrochloride forms B and C are useful for the administration of fexofenadine in mammals in the need of said treatment. They can be administered alone or in combination or in admixture with one or more known polymorphic forms of fexofenadine hydrochloride, for example those disclosed in WO 02/066429, U.S. 2003/0021849 or WO 95/31437. The content of each form in the mixtures depends on their physical and biological properties and will be determined by the skilled person. A variety of pharmaceutical compositions can be prepared for the administration in humans or animals, according to known techniques. The amount of fexofenadine hydrochloride in capsules, tablets, sugar-coated pills or other forms for the single administration ranges from about 30 to about 180 mg per dose unit. Therefore, the invention also provides a pharmaceutical composition comprising, as active ingredient, fexofenadine hydrochloride form B and/or C, or mixtures of at least one of them with one or more known polymorphic forms of fexofenadine hydrochloride in admixture with a suitable carrier and/or excipient. Said pharmaceutical composition can also optionally contain a therapeutically effective amount of pseudoephedrine.
- The following examples illustrate the invention.
- 278 g of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]-α,α-dimethylbenzeneacetic acid, 355 ml of water, 765 ml of methanol and 22.6 g of sodium hydroxide pellets are loaded in a 3 litres four-neck flask. The resulting mixture is heated to 40° C., then a solution of sodium borohydride (9.8 g) in 47 ml of water is added. When the reduction reaction is complete, the mixture is added with 40 ml of acetone and the pH is adjusted to a value ranging from 2.5 to 3 with 36% w/w hydrochloric acid. Thereafter, 140 ml of methanol and 450 ml of water are added, keeping the temperature at 40° C. The resulting mixture is slowly cooled to −15° C. and the resulting precipitate is filtered and washed with a 1/1 water/methanol mixture. The resulting product is dried under vacuum at 40° C. to constant weight. 265 g of fexofenadine hydrochloride are obtained with a 4.1% Karl-Fischer water content (therefore it can be referred to as monohydrate) and substantially characterised by the XRPD and DSC spectra reported in
FIGS. 1 and 2 . - 2650 ml of acetonitrile are loaded in a four-necked 3 litres flask, then heated to 45° C. 265 g of fexofenadine hydrochloride hydrate is added under stirring and the suspension is refluxed at (80-82° C.) for about one hour. The suspension is cooled to about −15/−10° C. in about 4 hours. The precipitated solid is filtered and washed with acetonitrile (2×80 ml) to obtain 285 g of wet product which, after drying under vacuum at 50° C. for 10 hours, yields 262 g of fexofenadine hydrochloride monosolvate with acetonitrile, having a XRPD spectrum and a 1H-NMR spectrum substantially as illustrated in
FIGS. 3 and 4 respectively and a 0.25% Karl-Fischer water content. - 262 g of fexofenadine hydrochloride form C, obtained as described in Example 2, are ground and dried under vacuum at 100° C. for 24 hours. 244 g of fexofenadine hydrochloride anhydrous form A are obtained, having a melting point between 153 and 156° C. and a XRPD spectrum having substantially the same characteristics as those reported in table 1 of WO 02/066429.
Claims (16)
1. Approximately monohydrate crystalline form of fexofenadine hydrochloride, having an XRPD spectrum substantially as reported in FIG. 1 .
2. The crystalline form of fexofenadine hydrochloride according to claim 1 , having an XRPD spectrum wherein the most intense diffraction peaks fall at 23.6; 10.1; 7.9; 5.2; 4.7 and 4.4 in 20.
3. The crystalline form of fexofenadine hydrochloride according to claim 1 or 2 , having a DSC spectrum characterized by three endothermic peaks at about 80.27; 109.27 and 149.14° C.
4. A process for the preparation of approximately monohydrate fexofenadine hydrochloride as defined in claim 1 , comprising the following steps:
preparation of a solution of fexofenadine hydrochloride in a methanol/water mixture;
cooling of the mixture at a temperature lower than −5° C.; and
separation of the precipitate.
5. The process according to claim 4 , wherein the volume ratio in the methanol/water mixture is between 0.8 and 1.25 v/v.
6. The process according to claim 4 or 5 , wherein the mixture is cooled to a temperature ranging from −10 to −25° C.
7. Crystalline form of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, having an XRPD spectrum substantially as that reported in FIG. 3 .
8. The crystalline form of fexofenadine hydrochloride according to claim 7 , having an XRPD spectrum wherein the most intense diffraction peaks fall at 7.0; 11.6; 15.4; 17.3; 18.0 and 20.5 in 20.
9. The crystalline form of fexofenadine hydrochloride according to claim 7 or 8 , having a 1H-NMR spectrum substantially as that reported in FIG. 4 .
10. A process for the preparation of fexofenadine hydrochloride, approximately monosolvate with acetonitrile, as defined in claim 7 , comprising the following steps:
preparation of a dispersion of fexofenadine hydrochloride hydrate in acetonitrile;
heating of the acetonitrile dispersion at a temperature ranging from about 70° C. to the reflux temperature;
cooling of the acetonitrile dispersion to a temperature lower than −5° C.; and
separation of the precipitate.
11. The process according to claim 10 , wherein the dispersion of fexofenadine hydrochloride hydrate in acetonitrile is obtained pouring fexofenadine hydrochloride hydrate in acetonitrile, previously heated to about 35-60° C., in a weight/volume ratio ranging from about 1/8 to 1/15.
12. The process according to claim 10 or 11 , wherein the acetonitrile dispersion is cooled to a temperature of about −15/−10° C.
13. A process for the preparation of anhydrous fexofenadine hydrochloride form A, comprising the removal of acetonitrile from crystals of approximately monosolvate fexofenadine hydrochloride with acetonitrile, as defined in claim 7 .
14. The process according to claim 13 , wherein acetonitrile is removed by heating under vacuum at about 80-110° C. for a time ranging from about 18 to 70 hours.
15. Pharmaceutical composition comprising, as active ingredient, approximately monohydrate fexofenadine hydrochloride, as defined in claim 1 , and/or fexofenadine hydrochloride, approximately monosolvate with acetonitrile, as defined in claim 7 , or mixtures of at least one of them with one or more known polymorphic forms of fexofenadine hydrochloride in admixture with a carrier and/or excipient.
16. The pharmaceutical composition according to claim 15 , further containing pseudoephedrine, as active ingredient.
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050256163A1 (en) * | 2004-04-26 | 2005-11-17 | Ilan Kor | Crystalline forms of fexofenadine hydrochloride and processes for their preparation |
US20060217557A1 (en) * | 2002-06-10 | 2006-09-28 | Barnaba Krochmal | Polymorphic form XVI of fexofenadine hydrochloride |
US20080095843A1 (en) * | 2006-07-11 | 2008-04-24 | Nutalapati Siva R K | Controlled-release formulations |
EP2105134A1 (en) | 2008-03-24 | 2009-09-30 | Ranbaxy Laboratories Limited | Stable amorphous fexofenadine hydrochloride |
US20100183717A1 (en) * | 2009-01-16 | 2010-07-22 | Kristin Arnold | Controlled-release formulations |
US20110190504A1 (en) * | 2006-07-27 | 2011-08-04 | Giorgio Bertolini | Process for preparing fexofenadine |
CN104072402A (en) * | 2014-07-16 | 2014-10-01 | 昆山龙灯瑞迪制药有限公司 | Fexofenadine hydrochloride compound of novel crystal form and preparation method of fexofenadine hydrochloride compound |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20070987A1 (en) * | 2007-05-16 | 2008-11-17 | Dipharma Francis Srl | PROCEDURE FOR THE PREPARATION OF KETONIC COMPOUNDS |
WO2011158262A1 (en) | 2010-06-15 | 2011-12-22 | Chemelectiva S.R.L. | Polymorphic form of fexofenadine hydrochloride, intermediates and process for its preparation |
IT1400965B1 (en) * | 2010-06-15 | 2013-07-05 | Dipharma Francis Srl | POLYMORFI OF FEXOFENADINA |
Citations (2)
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US20050025444A1 (en) * | 2003-07-31 | 2005-02-03 | Barnes Kathleen M. | Slide arrangement for cable drawer |
US20050165056A1 (en) * | 2001-02-23 | 2005-07-28 | Volker Kirsch | Method for producing non-hydrated fexofenadine hydrochloride and a novel crystalline form obtained thereby |
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DE69527429T2 (en) * | 1994-05-18 | 2003-03-20 | Aventis Pharma Inc | METHOD FOR PRODUCING WATER-FREE AND HYDRATE FORMS OF ANTIHISTAMINIC PIPERIN DERIVATIVES, POLYMERPHE AND PSEUDOMORPHE OF THEM |
ITMI20010270A1 (en) * | 2001-02-09 | 2002-08-09 | Germano Maina | MACHINE FOR VACUUM PACKAGING IN PLASTIC BAGS AND RIGID CONTAINERS |
US20030021849A1 (en) | 2001-04-09 | 2003-01-30 | Ben-Zion Dolitzky | Polymorphs of fexofenadine hydrochloride |
CA2450858C (en) * | 2001-06-18 | 2009-04-07 | Dr. Reddy's Laboratories Limited | Novel crystalline forms of 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-.alpha.,.alpha.-dimethylbenzene acetic acid and its hydrochloride |
DE60225694T2 (en) * | 2001-07-31 | 2008-06-26 | Texcontor Etablissement | NEW POLYMORPH OF FEXO-FENADIN |
CA2465913A1 (en) * | 2001-11-08 | 2003-05-15 | Judith Aronhime | Polymorphs of fexofenadine base |
DE03757471T1 (en) * | 2002-06-10 | 2005-09-01 | Teva Pharmaceutical Industries Ltd. | POLYMORPH FORM XVI OF FEXOFENADINE HYDROCHLORIDE |
GB0319935D0 (en) * | 2003-08-26 | 2003-09-24 | Cipla Ltd | Polymorphs |
-
2004
- 2004-06-08 IT IT001143A patent/ITMI20041143A1/en unknown
-
2005
- 2005-05-26 JP JP2005154155A patent/JP2005350459A/en active Pending
- 2005-05-31 EP EP05011652A patent/EP1614681A1/en not_active Withdrawn
- 2005-05-31 EP EP10157475A patent/EP2289878A1/en not_active Withdrawn
- 2005-06-07 US US11/145,927 patent/US20050282860A1/en not_active Abandoned
- 2005-06-07 CA CA002509311A patent/CA2509311A1/en not_active Abandoned
-
2008
- 2008-10-28 US US12/259,399 patent/US20090111853A1/en not_active Abandoned
Patent Citations (2)
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US20050165056A1 (en) * | 2001-02-23 | 2005-07-28 | Volker Kirsch | Method for producing non-hydrated fexofenadine hydrochloride and a novel crystalline form obtained thereby |
US20050025444A1 (en) * | 2003-07-31 | 2005-02-03 | Barnes Kathleen M. | Slide arrangement for cable drawer |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060217557A1 (en) * | 2002-06-10 | 2006-09-28 | Barnaba Krochmal | Polymorphic form XVI of fexofenadine hydrochloride |
US7671071B2 (en) | 2002-06-10 | 2010-03-02 | Teva Pharmaceutical Industries Ltd. | Polymorphic Form XVI of fexofenadine hydrochloride |
US20050256163A1 (en) * | 2004-04-26 | 2005-11-17 | Ilan Kor | Crystalline forms of fexofenadine hydrochloride and processes for their preparation |
US20080095843A1 (en) * | 2006-07-11 | 2008-04-24 | Nutalapati Siva R K | Controlled-release formulations |
US20110190504A1 (en) * | 2006-07-27 | 2011-08-04 | Giorgio Bertolini | Process for preparing fexofenadine |
US9403770B2 (en) * | 2006-07-27 | 2016-08-02 | Euticals Spa | Process for preparing fexofenadine |
EP2105134A1 (en) | 2008-03-24 | 2009-09-30 | Ranbaxy Laboratories Limited | Stable amorphous fexofenadine hydrochloride |
US20100183717A1 (en) * | 2009-01-16 | 2010-07-22 | Kristin Arnold | Controlled-release formulations |
CN104072402A (en) * | 2014-07-16 | 2014-10-01 | 昆山龙灯瑞迪制药有限公司 | Fexofenadine hydrochloride compound of novel crystal form and preparation method of fexofenadine hydrochloride compound |
Also Published As
Publication number | Publication date |
---|---|
ITMI20041143A1 (en) | 2004-09-08 |
CA2509311A1 (en) | 2005-12-08 |
US20090111853A1 (en) | 2009-04-30 |
EP2289878A1 (en) | 2011-03-02 |
EP1614681A1 (en) | 2006-01-11 |
JP2005350459A (en) | 2005-12-22 |
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